He's pronouncedly less than steady (5)
I believe the answer is:
teddy
'he's pronouncedly less than steady' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'he's pronouncedly' is the wordplay.
'he' becomes 'Ted'.
'pronouncedly' becomes 'dy' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ted'+'dy'='TEDDY'
Can you help me to learn more?
(Other definitions for teddy that I've seen before include "Stuffed bear" , "Child's soft toy" , "plaything" , "Bear - boy" , "Type of bear" .)